hi i simplized my problem in very long model in a short form

i have error for this x^3/x^2>=-2 constraint. i try pow_p and pow_p(x,3)+2*(x^2)>=0 but the errors remain like: {positive convex}+{positive convex}

{positive convex}>=0

is there any way to handle it in cvx

hi MCG thanks but i read it before. if i change variables like s>=x^3 and v>=x^2 and then change constraint to s/v>=-2 and then to s+2v>=0. it works. but is it true or not change? i dont know.if you know it is a true transform please verify that. if it is a false operation please mention that.

thanks again

Sorry, this is a software forum not a modeling forum. But here’s what I want to know: you have x^3/x^2\geq -2; why aren’t you just canceling that fraction and using x\geq -2?

A proper reading of the FAQ would have made it clear why your `pow_p`

attempt failed, and why *you shouldn’t have bothered to try it.*

Thanks again but in real model it isnt.I simpelized it.it has 24 x in up the fraction and 24 x in down of it. Every x has own cofficient.x^3 refer to skewness and x^2 refer to variance in a portfolio selection model. I regret that i must give up cvx.

But thanks for your time consuming

Indeed, it sounds like your problem is not convex, so CVX is not your tool.